/Engine/Source/Runtime/Core/Public/Unix/UnixPlatformRunnableThread.h
This includes guard page at the end of the stack to make running out of stack more obvious. Should be run in the context of the thread.
true if setting the alt stack succeeded. Inability to set guard page will not affect success of the operation.
static bool SetupSignalHandlerStack ( void * StackBuffer, const size_t StackBufferSize, void ** OutStackGuardPageAddress )